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  • 1
    ISSN: 1432-0428
    Keywords: Glucose ; duct ligation ; IMI ; secretin ; pancreozymin ; K-value
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé L'influence de la sécrétine et de la pancréozymine intravenieuses sur la sécrétion d'insuline a été étudiée chez des rats ayant une insuffisance pancréatique exocrine. La sécrétine et la pancréozymine ont causé une sécrétion d'insuline significative chez des rats normaux. L'effet de ces hormones a été différent chez les animaux ayant une insuffisance pancréatique exocrine; alors que la pancréozymine causait une sécrétion d'insuline chez ces animaux, la sécrétine n'en causait aucune. Le glucose intravenieux, quant à lui, produisait une augmentation d'insuline du sang même chez les rats ayant une insuffisance pancréatique exocrine. Il semble que seule l'action de la sécrétine sur la sécrétion d'insuline soit liée au pancréas exocrine intact. Par contre la pancréozymine stimule la sécrétion d'insuline même dans le cas d'une insuffisance pancréatique exocrine. Ces résultats in vivo sont indentiques à ceux obtenus avec les ilôts isolés du pancréas des rats.
    Abstract: Zusammenfassung Bei Ratten mit exokriner Pankreasinsuffizienz, erzeugt durch vollständige Ligatur sämtlicher Pankreasausführungsgänge mit anschließender fettiger Degeneration, wurde der Einfluß von Sekretin und Pankreozymin i.v. auf das immunologisch meßbare Insulin geprüft. Bei normalen Ratten führten Sekretin und Pankreozymin zu einer signifikanten Insulinausschüttung. Bei Tieren mit Pankreasinsuffizienz war ein unterschiedlicher Effekt beider Hormone nachzuweisen. Während Pankreozymin auch bei pancreasinsuffizierten Tieren einen deutlichen Anstieg der Insulinsekretion bewirkt, fehlt nach Sekretin die reaktive Insulinsecretion. I.v. Glucose bewirkte hingegen auch bei den pankreasinsuffizienten Ratten einen Insulinanstieg in Plasma. Offensichtlich ist lediglich die insulinstimulierende Wirkung von Sekretin an ein intaktes exokrines Pankreas gebunden, während Pankreozymin auch bei Pankreasinsuffizienz das Inselsystem zur Insulinabgabe veranlaßt. Diese Befunde in vivo sind übereinstimmend mit den Versuchen an isolierten Inseln der Ratten.
    Notes: Summary A comparison was made of the effects of the intestinal hormones secretin and pancreozymin on insulin secretion in non-diabetic rats with experimentically induced exocrine pancreatic insufficiency and in control animals. The rats with exocrine pancreatic insufficiency exhibited normal disappearence of glucose and secretion of insulin. In rats with exocrine pancreatic insufficiency secretin did not lead to any increase in insulin secretion in contrast to its effect in the controls. In rats with exocrine pancreatic insufficiency pancreozymin evoked secretion of insulin to the same extent as in the normal animals. — From these results it is inferred that the effect of secretion upon the β-cells of the rat is dependent upon the presence of intact exocrine pancreatic tissue. However, pancreozymin and glucose exert their effects upon the β-cells directly without the involvement of the exocrine portion of the pancreas. All of these findings made under conditions in vivo are in perfect accord with studies made on isolated islets of rats subjected to the same stimuli in the preparation in vitro.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1433-8580
    Keywords: Oscillations ; Insulin ; Glucose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The present study was designed to determine the effect of low dose continuous and oscillatory intraportal insulin infusions upon subsequent glucose-induced insulin release. In overnight-fasted and anesthetized rats with indwelling catheters in the jugular vein, carotic artery, and mesenteric vein insulin was infused intraportally for 3 h via the mesenteric vein catheter at a continuous rate of 45 µU/kg·min, or the same amount of insulin was administered at alternating high (72 µU/kg·min) and low infusion rates (18 µU/kg·min), respectively, in 2-, 4-, 8-, and 16-min cycles (oscillatory infusions). Another group received a continuous infusion of saline. Glucose (0.4 g/kg) was given i.v. 30 min after the end of the insulin or saline infusion. During the 3-h infusion of insulin or saline the peripheral glucose level remained unchanged in all groups. In response to the i.v. glucose load peripheral arterial plasma insulin levels were significantly elevated after preceding oscillatory infusions compared to the continuous insulin infusion. As compared to the group receiving saline the glucose-induced insulin response after continuous insulin infusion was significantly reduced. The plasma glucose responses were not different except for inexplicably elevated glucose levels in the 4-min cycle group. No difference was observed for plasma glucagon levels in all groups. The present data demonstrate an augmented responsiveness of theβ-cell to glucose after a preceding oscillatory infusion of insulin and an impaired responsiveness to glucose after continuous insulin infusion. This indicates that an oscillatory insulin release might be of importance for an adequate regulation ofβ-cell function.
    Type of Medium: Electronic Resource
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